CS601 Solved MCQ's

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(1)   There are three types of Hubs that exist. Which of the following options correctly describes these three.

1. Passive, dormant, special
2. Active , dormant , passive
3. Passive, Active, Turbo
4. Passive, Active, Intelligent
ANS:----
2. A number of different factors determine the cost of a Hub. Which of the following is among these factors?

1. Speed rating
2. Durability
3. Brand
4. Class



(3) Three(3) basic devices are used in setting up a single Network. Which of the following best describes these devices?

1. NIC (Ethernet), Hub, Twisted pair/Coaxial cable
2. Disk drive, CPU, Hub
3. Hub, CPU, NIC (Ethernet)
4. Disk drive, Hub, NIC (Ethernet)



4. Which of the following network topologies among the list below is incorrect?
1. Star
2. Internet
3. Ring
4. Bus

4. Which of the following is not a feature of Base band Coaxial Cable?
1. Bi-directional
2. Few Kilometer ranges
3. Proton based
4. Ethernet (basis for 802.3) at 10 Mbps

4. Which of the following is not a function of a repeater?

1. Uses Jumper Settings
2. Transmits data in both directions
3. No Buffering
4. Joins two(2) segments of cables

4. Which level of the TCP/IP reference model routes data/information across a network channel ?
1. Application layer
2. Data Link Layer
3. Transport Layer
4. Network Layer



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4. The function of a modem is to convert signals. Identify the correct signals it converts.

1. Analogue to Digital
2. Analogue to Baud rate
3. Baud rate to Analogue
4. Digital to Binary



4. Which of the following is not a LAN – Architecture?.
(a) Protocol architecture

2. Media access control
3. Logical Protocol
4. Logical Link Control

4. Identify the statement which best describes TCP and UDP.
1. TCP is a connection oriented Protocol whiles UDP is a datagram service
2. TCP is a protocol for the Network Layer of the OSI
3. UDP and TCP could be used interchangeably
4. TCP is an advanced protocol whiles UDP is a single protocol

4. Which of the following characteristics best describes a frame?

1. Data link layer(Header, Trailer, Data)
2. Network Layer(Header, Trailer, Data)
3. Transport Layer(Header, Trailer, Data)
4. Physical Layer(Header, Trailer, Data)


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4. What does the terminology ISDN mean?

1. Internal Digital Services Network
2. Integrated Systems Digital Network
3. Integrated Services Digital Naming System
4. Integrated Services Digital Network

4. What does the terminology ATM mean?

1. Automatic transfer mode
2. Automatic translation mode
3. Asynchronous transfer mode
4. Asynchronous transformation mode

4. A simple Architecture for File Transfer is made up of :

1. File transfer application; Communications service module; Network access module
2. File transfer application; transport layer; Network access module
3. Network access layer; Transport layer; Application layer
4. Application layer; Network layer; Session layer

4. Which of the following statements is true about standards?

1. Standards create additional cost
2. Standards help individuals users to increase effectiveness
3. Standards allow products from multiple vendors to communicate
4. Standards cannot freeze technology



4. Which of the following statement is true about FLOW CONTROL?

1. Flow control is a function performed by a receiving entity to limit the amount or rate of data on a network.
2. Flow control adjusts the weights on a network
3. Flow control is a function performed by the MODEM
4. Flow control is an advanced form of network management


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4. Identify the most suitable description for ERROR CONTROL?

1. Error control is an activity that manages deadlock.
2. Error control is an advanced form of parity bit
3. Error control is a sub-function of a modem and Hub
4. Error control is needed to guard against loss or damage of data

(18) What is the full meaning of the terminology SMTP?

1. State Mail Transfer Protocol
2. Simple Mail Tailor Protocol
3. Simple Management Transfer Protocol
4. Simple Mail Transfer Protocol

19. Several Computers connected together is called:

1. Client-server
2. Client
3. Computer network
4. Hub

19. In which of the following networks does the client submit a task to the server, then the server executes and returns the result for the requesting client station?

1. Peer-to-Peer

2. Client-Server

3. Server-Based
4. All of the above

19. In which network topology are all workstations connected in cascade form?

1. Star
2. Ring
3. Mesh
4. Bus

19. Which network topology uses a Hub?
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1. Star
2. Bus
3. Mesh
4. Ring

    

Question No: 1    ( Marks: 1 )    - Please choose one

 In RS 422 Balanced mode two lines carry ________ signals which are not identical to each other.

       ► same

       ► different

       ► digital

       ► analog

   

Question No: 2    ( Marks: 1 )    - Please choose one

 The __________ generates the data and passes it along with any control information to a ___________.

       ► DTE; DCE

       ► DCE; DTE

       ► DCE; node

       ► DTE; application

   

Question No: 3    ( Marks: 1 )    - Please choose one

 In _____________ transmission, a start bit and a stop bit frame a character byte.

       ► Asynchronous serial

       ► Synchronous serial

       ► Parallel

       ► Asynchronous & Synchronous serial

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Question No: 4    ( Marks: 1 )    - Please choose one

 In _____________ transmission, bits are transmitted simultaneously, each across its own wire.

       ► Asynchronous serial

       ► Synchronous serial

       ► Parallel

       ► Asynchronous & Synchronous serial

   

Question No: 5    ( Marks: 1 )    - Please choose one

 Asynchronous transmission is ___________

       ► slow

       ► costly

       ► non-effective

       ► fast

   

Question No: 6    ( Marks: 1 )    - Please choose one

 In ____________ transmission the timing of the signal is unimportant.

►Asynchronous

►Synchronous

►Polar

►Bi-polar

   

Question No: 7    ( Marks: 1 )    - Please choose one

 In 8QAM each signal shift or one baud represents ______.

       ► 4 bits

       ► 2 bits

       ► 5 bits

       ► 3 bits

   

Question No: 8    ( Marks: 1 )    - Please choose one

 PCM is the first process of PAM.

       ► True

       ► False

   

Question No: 9    ( Marks: 1 )    - Please choose one

 Bi phase encoding is a type of bipolar encoding in which we use two voltage levels.

       ► True

       ► False

   

Question No: 10    ( Marks: 1 )    - Please choose one

 The amplitude of a digital signal depends upon the________ to represent a bit.

       ► phase

       ► voltage

       ► wavelength

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Question No: 11    ( Marks: 1 )    - Please choose one

 Time domain plot show changes in signal phase with respect to time.

       ► True

       ► False

   

Question No: 12    ( Marks: 1 )    - Please choose one

 OSI model was developed prior to TCP/IP model.

       ► True

       ► False

   

Question No: 13    ( Marks: 1 )    - Please choose one

 The _________ layer is the layer closest to the transmission medium.

       ► physical

       ► data link

       ► network

       ► transport

   

Question No: 14    ( Marks: 1 )    - Please choose one

 Data chunk at data link layer is called________

►frame

►packet

►datagram

   

Question No: 15    ( Marks: 1 )    - Please choose one

 The internet model consists of _________ layers.

       ► three

       ► two

       ► five

       ► seven

   

Question No: 16    ( Marks: 1 )    - Please choose one

 __________representation of links that connect nodes is called as physical topology.

►geometrical

►logical

►physical

   

Question No: 17    ( Marks: 1 )    - Please choose one

 _______ is a multipoint topology.

       ► Ring

       ► Mesh

       ► Tree

       ► Bus

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Question No: 18    ( Marks: 1 )    - Please choose one

 In mesh topology, if there are five nodes then there will be  _______ links.

       ► 5

       ► 10

       ► 15

       ► 20

   

Question No: 19    ( Marks: 1 )    - Please choose one

 Non proprietary standard is also termed as de facto standard.

       ► True

       ► False

   

Question No: 20    ( Marks: 1 )    - Please choose one

 Effective network mean that the network has fast delivery, timeliness and

       ► high bandwidth

       ► Duplex transmission

       ► accurate transmission

       ► Low bandwidth

   

Question No: 21    (Marks: 2)

 What is purpose of distributed processing?

   

Question No: 22    (Marks: 3)

 What is HDB3?

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Question No: 23    (Marks: 5)

 Differentiates between the following terms. [10 marks]

            (a) Syntax and Semantics of protocol.

            (b) Network management and exchange management.

            (c) Monolithic and structured.

   

Question No. 4 Marks: 2

The __________ layer is the layer closest to the transmission medium.

􀂐 Physical

􀂐 Data Link

􀂐 Network

􀂐 Transport

Question No. 5 Marks: 2

The information to be communicated in a data communication system is the

___________.

􀂐 Medium

􀂐 Protocol

􀂐 Message

􀂐 Transmission

Question No. 6 Marks: 2

In ________________ transmission a timing of signal is unimportant.

􀂐 Synchronous

􀂐 Asynchronous

􀂐 Both

􀂐 None of these

Which of the following is most affected by voice?

􀂐 QAM

􀂐 ASK

􀂐 FSK

􀂐 PSK

The __________ layer is the layer closest to the transmission medium.

􀂐 Physical

􀂐 Data Link

􀂐 Network

􀂐 Transport

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Which error detection method uses ones complement arithmetic?

􀂐 Simple parity check

􀂐 Two-dimensional parity check

􀂐 CRC

􀂐 Checksum

Question No. 2 Marks : 2

In a time-domain plot, the vertical axis is the measure of ________.

􀂐 Amplitude

􀂐 Frequency

􀂐 Phase

􀂐 Time

Which topology requires a multipoint connection?

􀂐 Mesh

􀂐 Star

􀂐 Bus

􀂐 Ring

Draw the sender and receiver windows for a system using Go-Back-N ARQ, given the

following:

a. Frame 0 is sent; frame 0 is acknowledged.

b. Frames 1 and 2 are sent; frame 1 and 2 are acknowledged.

c. Frames 3, 4 and 5 are sent; frame 4 is acknowledged; timer for frame 5 expires.

d. Frames 5, 6 and 7 are sent; frames 4 through 7 are acknowledge.

A timer is set when ___________ is (are) sent out.

􀂐 A data frame

􀂐 An ACK

􀂐 A NAK

􀂐 An ARQ

If the data unit is 111111, the divisor 1010, and the remainder 110, what is the

dividend at the receiver?

􀂐 111111011

􀂐 111111110

􀂐 1010110

􀂐 110111111

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In cyclic redundancy checking, what is the CRC?

o the divisor

o the quotient

o the dividend

o the remainder

In fiber optics the signal source is ____________waves.

o Light

o Radio

oVery Low frequency

o  Infrared

Which multiplexing technique shifts each signal to a different carrier frequency?

o FDM

o Synchronous TDM

o Asynchronous TDM

o None of the above

The _____________of a signal is the width of the frequency spectrum.

o Amplitude

o Bandwidth

o Bit interval

o Phase

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By ADEEL ABBAS, Bhakkar. AdeelAbbasbk@gmail.com